I think the answer to this is a big time yes. The price difference was absurd for what you got. From their end the cost is the same to manufacture. It wouldn't surprise me if the 60/75 split was greater than 80/20. At that rate you actually make more money doing what they are doing where you just raise the price by $2k and make them all 75s.
Plus it basically makes no difference for most peoples' daily driving or road tripping. It's going to be a painful road trip if you needed to supercharge that last 20% of the battery (which would effectively double or triple the charging time versus a 90D/100D charging to the same rated mileage), so basically it's for people with occasional access to L2 charging or whose daily driving is in that 210-250mi range….
IMO the 60/60D was a steal because it gave you most of the practical benefits of a 75 while paying a lot less.